28 G-. O. Sårs. 



were present in about equal numbers. The Rev. R. L King 

 detected this form at Coogee, near Port Jackson, and the speci- 

 mens examined by Prof. Claus were probably from the same tract. 

 Distribution. If my identification of this form with 

 Estheria compressa of Baird be correct, the distribution of 

 the species extends to India. 



Gen. Estheria, Riippel. 



3. Estheria Packardi, Brady. 



(PL 4 & 5.) 



Estheria Packardi, Brady. Notes on Freshwater Ento- 

 mostraca from South Australia. Proc. Zool. Soc, of London, 

 1886, p. 85, fig C. 



Syn.: ? Estheria Boysii, Baird. 



Specific Characters. Shell rather tumid and, seen 

 from the side, of oval or elliptic form, with the umbones well 

 defined and occurring much nearer the anterior than the 

 posterior extremity, dorsal margin almost straight in the middle, 

 ventral gently curved, anterior extremity short and broad, 

 blunted at the tip, posterior extremity somewhat produced 

 and narrowly rounded at the tip; — seen from above, oblong- 

 oval, with the greatest width across the umbones, posterior 

 extremity more pointed than the anterior. Shell of male but 

 little differing from that in the female, though having the 

 posterior extremity somewhat narrower and more produced. 

 Valves with numerous very distinct and somewhat elevated 

 lines of growth (amounting to 24). Outer shell-lamella of 

 rather firm consistency and striated radially between the lines 

 of growth, edge without any spines or bristles. Structure of 

 the animal apparently not differing essentially from that in the 

 typical species Colour of shell, in alcoholic specimens, a uni- 



